Extremely bad service from discovery health

Iam extremely disappointed in Discovery health after being a member for 6 years and another 6 years prior with a total of 12 years membership. I was given an amount outstanding of R15000 to settle and made arrangements to pay it off so that I could take up new cover. After a few weeks they came back to me stating they had made a mistake and tripled the amount to 52 000 I was owing with an explanation I still do not understand. I accepted to pay and sent in a new arrangement plan. I was told the turn around time was 3 to 5 days however I have been waiting for weeks to get a response. No one seems bothered, I called them numerous times and today I was put on hold for more than 20 minutes. It is pathetic because I have spent thousands and yet no one cared to help me. Mind you, I had 2 separate accounts and I made payment in the wrong account which I asked them to allocate to the right account which was the premiums but they declined my plea putting me in this mess in the 1st place because I was expected to pay a double premium. I cannot Believe that a huge company such as this do not care about their clients. I hang up as I couldn't hold on anymore but no one had the decency to call me back.